Magnetic interactions between small Ni clusters

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• 作者：Rodrí ; guez-Ló ; pez ; J.L. ; Aguilera-Granja ; F. ; Vega ; A. ; Alonso ; J.A.
• 关键词：A. Nanostructures ; A. Magnetically ordered materials ; 36.40.Cg ; 75.30.Pd ; 75.50.&minus ; y
• 刊名：Solid State Communications
• 出版年：2000
• 期刊代码：101_00381098
• 类别：ms
• 出版时间：October 3, 2000
• 卷：116
• 期：6
• 页码：309-314
• 文件大小：327 K

摘要

We have calculated the magnetic moment per atom, μ¯, of symmetric nickel cluster-dimers Ni_N–Ni_N as a function of cluster–cluster distance D and cluster size N. The spin-polarized electronic structure has been calculated with a self-consistent tight-binding method considering the 3d, 4s and 4p valence electrons. We have analyzed the partial sp and d contributions to μ¯. The d component shows a monotonic behavior and provides the dominant contribution to μ¯, whereas the sp contribution shows a non-monotonic (and complex) behavior as a function of the distance and of cluster size. The approaching clusters change their intrinsic magnetic moments at separations of the order of the bulk first nearest-neighbor distance d_fn. For N